Mercruiser Drive

Shift Shaft Bushing Assembly 65529

The 65529 Shift Shaft Bushing Assembly is a Sierra replacement component designed for MerCruiser Alpha One Gen II sterndrives. This assembly supports and seals the shift shaft where it passes through the drive housing, ensuring smooth shifting and proper sealing.

Fitment Overview

This bushing assembly replaces Mercury / MerCruiser part numbers 815921A2, 815921A6, 815921A8, 815921A10, 815921A17, and 815921A21.

These OEM numbers are used specifically on MerCruiser Alpha One Gen II sterndrives across multiple production years.

Compatibility

Commonly used on Alpha One Gen II drives across a wide range of boat applications including runabouts, cruisers, and fishing boats.

Fits These Serial Ranges

Typical application includes Alpha One Gen II sterndrives within serial ranges such as:

• 0D469859 through later Alpha One Gen II production

Important: Always confirm fitment using your sterndrive serial number or OEM part number.

Looking for the OEM version of this part?
View OEM MerCruiser Shift Shaft Bushing Assembly

Part Numbers and Cross References

What This Part Is Used For

This assembly supports the shift shaft and provides sealing where it enters the sterndrive housing. It is critical for maintaining proper gear engagement and preventing water intrusion into the drive.

• Supports shift shaft alignment
• Seals shift shaft entry point
• Maintains smooth shifting operation
• Helps prevent water intrusion into the drive

A worn or damaged bushing can cause shifting issues, leaks, or internal drive damage.

System Function and Connections

• System Type: Sterndrive shifting system
• Component Type: Shift shaft bushing and seal assembly
• Location: Alpha One Gen II drive housing

FAQ

What does this part fit?
It fits MerCruiser Alpha One Gen II sterndrives.

Is this for outboard engines?
No, this part is used in sterndrives only, not outboard lower units.

What does this part replace?
It replaces 815921A2, A6, A8, A10, A17, and A21.

Why is this part important?
It ensures proper shifting and helps prevent water from entering the drive.

Searchable Part Numbers

65529, 815921A2, 815921A6, 815921A8, 815921A10, 815921A17, 815921A21, MerCruiser Alpha One Gen II shift shaft bushing